If you ever need to do a brake swap especially if going from small bolt pattern to big bolt pattern then here is a link to all the info to do so. I would have copied it, but there is a copyright on the bottom of the page.

all i ever did was use 73 and up a-body rotor,spindle,caliper,and upper control arm cause ball joint is different,and master cylinder.have that on all my dusters.used to find them at the salvage yards all the time but really hard anymore.i should've bought everyduster back then.i did buy all the ralley wheels and good fenders,doors,hoods.

You are correct and as long as you don't have the small ball joint you don't have to swap the upper arm either. The main problem is, that a lot of people that are not in the know try to tell people to use F,M,J,B, or R body spindles to do a disc brake swap. These spindles are too tall and cause a lot of suspension problems. Plus some want to go to larger discs for more stopping power for racing and such. I copied part of that article that talks about not using the spindles above. A friend and I have both tried them way before the article came out and they just wont work. Now if you was designing a purpose built race car, you cold work the taller spindle into the set up, but it wont work on stock pieces.

Do not succumb to the temptation to use "lookalike" knuckles from later Mopars, such as 73-up B/R-bodies, F/J/M bodies, etc. These parts, while visually very similar, are taller, altering suspension geometry (camber change, bump steer, etc.), and possibly forcing the ball joints beyond their designed range, a/k/a “over angling”.

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grassy wrote:So if you are staying with the 5*4 bolt pattern..all you need is the spindle, caliper and router ? ..everthing else fits ?

I thought you needed the upper control arm and the lower..

I gather that you also need the shield and the prop valve ??

Grassy

IF you have the 5x4 bolt pattern all you need to swap it over ti 5 x 4 1/2 is the new rotors, caliper, caliper mount, and the 73 up spindles from an A body '73 and up or spindles from a B or E before '73, and if your car is '72 or older, you need the '73 up upper A arm so you can use the larger ball joint. You'll also need a master cyl for a disc brake car cause the resivior to the front calipers are larger than to a drum set up. And the you'll need the prop valve for the disc car too so you wont be locking up the front wheels.

Need any more help, just let me know and I'll help you out with it.

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Welcome,anytime. If you took everything from the '74 you should have very thing you need for the swap. Just let me know if you have any questions. If you have some pics of what you are working on, post them up. I am sure all will want to see. And glad you joined up. Tell your Mopar friends and lets try to help this site grow.

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